I bought these a while ago while waiting for a replacement shower tile. Finally I could use it and I'm very impressed. I have a lot of taps and sockets in my shower that require drilling a lot of holes in the tiles. This light was easy to use, intuitive in design and worked flawlessly in my application. I particularly like the integrated hole saw guide, with which I was able to guide my carbide hole saw precisely during the entire drilling process. The different hole sizes were perfect because I had to drill multiple holes of different sizes. Once installed and tightened, the device would not stop holding its position. The knurled handles were very helpful, especially with wet hands. worth your money!